Can two applications be signed with the same signing certificate?

Application modularity – The Android system allows applications that are signed by the same certificate to run in the same process, if the applications so requests, so that the system treats them as a single application.

How do I sign an APK with an existing keystore?

Sign the app with existing keystore

1. Open command prompt and go to jarsigner path.
2. Jarsigner will be usually found in jdk\bin folder.
3. Run the following command.
4. You will be prompted to enter the password of the key store file.
5. The apk will be signed but no new apk will be generated instead it’ll be overwritten.

Can I copy a keystore from one server to another?

1 Answer. Keystores are simply files in a format used by java for storing keys and certificates. They do not contain any information which ties them to a particular system. They can be freely copied between systems and directories as required.

How do I find out which keystore was used to sign an app?

Alternatively, you can use Java 7’s Key and Certificate Management Tool keytool to check the signature of a keystore or an APK without extracting any files. The output will reveal the signature owner/issuer and MD5, SHA1 and SHA256 fingerprints of the APK file app. apk or AAB file app.

Can we use the same keystore for Android?

A keystore is just a means to securely store the public/private key pair which is used to sign your Android apks. So yes, you can use the same keystore to sign multiple apks, without a problem. You can also use the same alias (each alias is a certificate) to sign multiple apks, and it will work.

How do I make an Android signing key?

How to create an Android Keystore file

1. Open KeyStore Explorer and press the button Create a new KeyStore to start creating a keystore file.
2. Select JKS as the new KeyStore type.
3. Press the Generate Key Pair button to start filling the keystore file with authentication keys.

Can I use same keystore for multiple apps?

How do I sign an APK file on my Android?

Sign your app for release to Google Play

1. In the menu bar, click Build > Generate Signed Bundle/APK.
2. In the Generate Signed Bundle or APK dialog, select Android App Bundle or APK and click Next.
3. Below the field for Key store path, click Create new.

Can I copy keystore?

Is there a possibility to copy an existing keystore? Yes. From the file system perspective it is just a file.

Can I copy Cacerts from one machine to another?

You can’t just copy the cacerts file (where the certs are stored) over because different versions of Java have different certs distributed with them.

How do I find my signing key?

Here’s where to find the certificate:

1. Open Play Console and go to the Play App Signing page (Release > Setup > App integrity).
2. Scroll to the “App signing key certificate” section and copy the fingerprints (MD5, SHA-1, and SHA-256) of your app signing certificate.

How do I add a signature to a keystore?

How we can check SHA1 or Signature of APK and Keystore file

1. Open your folder where you store your APK file in the terminal.
2. Now you need to run this command keytool -printcert -jarfile app-release.
3. Once you enter the above command you will get your Certificate fingerprints information as shown in the below image.

Is it possible to sign multiple apps with the same keystore?

Yes, you can sign several applications with the same keystore. But you must remember one important thing : if you publish an app on the Play Store, you have to sign it with a non debug certificate. And if one day you want to publish an update for this app, the keystore used to sign the apk must be the same.

Can I have more than one app with the same signature?

Package name + signature combo must be unique, i.e. one App can’t have multiple official publishers: Device won’t update same App package with different signature. Play store won’t let you update same package file with different signature. Device can have many Apps with different package names but same signature.

Should I sign all my Android apps with the same certificate?

From The App-Signing Guide of the Android Developer’s site: In general, the recommended strategy for all developers is to sign all of your applications with the same certificate, throughout the expected lifespan of your applications. There are several reasons why you should do so…

What is a keystore file and how to use it?

The answer I would provide is that a keystore file is to authenticate yourself to anyone who is asking. It isn’t restricted to just signing .apk files, you can use it to store personal certificates, sign data to be transmitted and a whole variety of authentication.